A distributed method of establishing a path in a multi-dimensional computer network comprising a plurality of nodes for transmitting isochronous data from a source node to a destination node is disclosed. or lower and is lightweight and compositionally homogeneous. The remote telemeters communicate bi-directionally with a number of ceiling-mounted RF transceivers, referred to as VCELLs, using a wireless TDMA protocol. A second of the processing nodes stores a start LUN value in non-volatile storage, and is arranged to perform, on boot-up, a device discovery procedure in which it scans the shared data storage system to find storage units with LUNs not less than the start LUN value. When at least one of the switches SW1 to SW4 is off, an X-axial output is calculated based on the capacitance values of the capacitance elements C1 and C2, and a Y-axial output is calculated based on the capacitance values of the capacitance elements C3 and C4. The length of the inner tubular wall is such that L1D>0.